Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and external-scope are covered. The description adds only 'capped', which hints that results are truncated, and says nothing about how the type sections relate or whether discovery must precede retrieval. Modest added value over annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.